Season 4 aired between 23 Jan 1998 and 18 Dec 1998, 26 episodes.
Episodes
E01
Criminal Nature
23 Jan 1998
E02
The Hunt
30 Jan 1998
E03
Hearts and Minds
06 Feb 1998
E04
In Another Life
16 Feb 1998
E05
In the Zone
20 Feb 1998
E06
Relativity Theory
27 Feb 1998
E07
Josh
06 Mar 1998
E08
Rite of Passage
13 Mar 1998
E09
Glyphic
20 Mar 1998
E10
Identity Crisis
27 Mar 1998
E11
The Vaccine
03 Apr 1998
E12
Fear Itself
10 Apr 1998
E13
The Joining
17 Apr 1998
E14
To Tell the Truth
24 Apr 1998
E15
Mary 25
29 May 1998
E16
Final Exam
05 Jun 1998
E17
Lithia
03 Jul 1998
E18
Monster
10 Jul 1998
E19
Sarcophagus
07 Aug 1998
E20
Nightmare
14 Aug 1998
E21
Promised Land
21 Aug 1998
E22
The Balance of Nature
04 Sep 1998
E23
The Origin of Species
27 Nov 1998
E24
Phobos Rising
04 Dec 1998
E25
Black Box
11 Dec 1998
E26
In Our Own Image
18 Dec 1998